Make ScreenOrientationController a FrameDestructionObserver.

Source/modules/screen_orientation/ScreenOrientation.cpp

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "config.h"
 #include "modules/screen_orientation/ScreenOrientation.h"
 
 #include "bindings/core/v8/ScriptPromise.h"
 #include "bindings/core/v8/ScriptPromiseResolver.h"
 #include "core/dom/DOMException.h"
@@ skipping 75 matching lines @@
 // static
 ScreenOrientation* ScreenOrientation::create(LocalFrame* frame)
 {
     ASSERT(frame);
 
     ScreenOrientation* orientation = adoptRefCountedGarbageCollectedWillBeNoop(new ScreenOrientation(frame));
     ASSERT(orientation->controller());
     // FIXME: ideally, we would like to provide the ScreenOrientationController
     // the case where it is not defined but for the moment, it is eagerly
     // created when the LocalFrame is created so we shouldn't be in that
-    // situtaion.
+    // situation.
     // In order to create the ScreenOrientationController lazily, we would need
     // to be able to access WebFrameClient from modules/.
 
     orientation->controller()->setOrientation(orientation);
     return orientation;
 }
 
 ScreenOrientation::ScreenOrientation(LocalFrame* frame)
     : DOMWindowProperty(frame)
     , m_type(WebScreenOrientationUndefined)
@@ skipping 76 matching lines @@
     return ScreenOrientationController::from(*m_frame);
 }
 
 void ScreenOrientation::trace(Visitor* visitor)
 {
     EventTargetWithInlineData::trace(visitor);
     DOMWindowProperty::trace(visitor);
 }
 
 } // namespace blink